There are two ways to rent a house through an intermediary company: one is to sign a tripartite contract when the intermediary is an intermediary; If it is an intermediary agent, it will only sign a contract with the intermediary.

(If only the lessor and the lessee sign the contract), the intermediary company will show people the house and sign a tripartite contract if they take a fancy to it. I don't understand why they all signed it. Do employees of intermediary companies do private bills?